package com.sky.interceptor;

import com.sky.context.BaseContext;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        /**
         * 从请求头中获取token,并解析
         * authentication 前台传输过来的参数名称，不能变，要和前台保持一致
         */
        String token = request.getHeader("authentication");
        if(token==null){
            //设置401
            response.setStatus(HttpStatus.UNAUTHORIZED.value());
            return false;
        }
        //校验token
        Claims claims = JwtUtil.getClaimsBody(token);
        int i = JwtUtil.verifyToken(claims);
        if(i==1 || i==2){//表示过期了
            //设置401
            response.setStatus(HttpStatus.UNAUTHORIZED.value());
            return false;
        }
        Long userId= Long.valueOf(claims.get("id").toString());
        if(userId!=null){
            //如果有登录数据，代表一登录，放行
            BaseContext.setCurrentId(userId);
            return true;
        }else{
            //否则，发送未认证错误信息
            response.setStatus(401);
            return false;
        }
    }

}
